Presented by Karen Compton, Jane Smith and Claudia Wallace in the ACT2 stand at CAST2010 in Houston, Texas

6. Energy

9. Engage Hot and cold packs Freeze a beaker to a board Dissolve CaCl 2 in H 2 O

12. CH 4 + 2 O 2  2 H 2 O + CO 2 + heat Is this reaction exothermic or endothermic? reactants  products Add the energy component if the reaction is endothermic Add the energy component if the reaction is exdothermic

13. An 85.0 g sample of brass is heated to 95.0ºC and placed in 100.0 g of water at 6.5ºC. The water reaches thermal equilibrium at 15.7ºC. What is the specific heat of this brass? A piece of copper alloy with a mass of 85.0 g is heated from 30.0 o C to 45.0 o C. In the process, it absorbs 523.0 joules of heat energy. What is the specific heat of the copper alloy? Straight specific heat calculation q = mc∆T Heat lost = heat gained calculation q = mc∆T

14. Taught in matter unit x y Label the areas on the phase diagram. Describe the changes that occur as you move from point x to y in both directions. What is the normal melting point (boiling point) of this substance?

15. Calculate the amount of heat, in joules, required to convert 180 grams of water at 10.0  C to steam at 105.0  C. specific heat of water = 4.18 J/g  C; specific heat of steam = 2.03 J/g  C; heat of vaporization of water = 2.26 x 10 3 J/g. Describe the energy flow in areas B  C E  D using the terms endothermic and exothermic or what sign would be given to q in these areas?